Laminar Seal Rings
A Smalley Laminar Seal Ring set is a metallic labyrinth seal
consisting of multiple rings in a groove. The arrangement
and the specific orientation of the rings are dictated by the
application and the severity of the environment. There are
16 series of standard imperial and Metric Laminar Seal Ring
configurations from which to select. 8 of these series are
sets consisting of single-turn rings. The other 8 series are
sets consisting of double-turn rings. Within each series are
operational ring-set configurations in both imperial and
metric sizes. The selection of the appropriate set should be
determined by the application.
For some applications a complete labyrinth configuration
(i.e.; a complete labyrinth configuration is one which has
rings staggered within the set) is necessary due to a severe
environment where contamination is highly probable. In
other applications design engineers can keep the groove
dimensions minimal by specifying laminar sets with rings
clinging either to the bore or to the shaft.
Laminar Seal Rings
Available From Stock
Advantages of
Laminar Seal Rings
• No friction with other rotating components, ideal for high
speed applications.
• Prevent dirt and splash water from contaminating
components.
• When used in conjunction with other seals, Laminar Seals
provide a primary seal against severe contamination,
before the contaminants come in contact with the
secondary seal.
• Sets of multiple rings provide an efficient labyrinth seal.
• Rings may be produced from a wide variety of alloys
to withstand more severe conditions including higher
temperatures and corrosive environments.
• As a metallic mechanical seal they can outperform rubber
seals in durability and life expectancy.
• The change from rubber to metal reduces the need for
frequent seal replacement.
Standard parts from 5/8’’ to 50’’ and 15 mm to 1,300 mm.
Special seals manufactured with No-Tooling-Charges.
Smalley’s Laminar Seal Rings are interchangeable with
FEY Rings.
INTERCHANGE LISTING
SMALLEY
FEY
QH
AS
QHK
ASK
QS
IS
QSK
ISK
QHD
ASD
QHKD
ASKD
QSD
ISD
QSKD
ISKD
FK3
FK6
CONSULT SMALLEY ENGINEERING FK5
Manufactured in USA
Smalley (847) 719-5900 103
Laminar Seal Rings
Selection Guide
Standard Laminar Ring Sets Available
Single -Turn Laminar
Seal Rings
Used in a variety of applications, this series of Seal Rings
should be utilized for light to medium duty applications,
dependent on the ring configuration specified. The sets
are comprised of single-turn rings in either 3 rings per set
or 5 rings per set.
APPLICATIONS: 3 ring sets protect components from low
dirt and low splash water contamination. 5 ring sets provide
a better labyrinth seal to protect components from medium
dirt and medium splash water contamination.
Double -Turn Laminar
Seal Rings
The sets are comprised of double-turn rings in either 2 rings
per set or 3 rings per set. The double-turn rings fit tighter in
the bore or on the shaft, provide complete 360° surface
contact and resist higher axial/radial forces than single-turn
ring sets, for medium to heavy duty applications.
APPLICATIONS: 2 ring sets protect components from
medium dirt and medium splash water contamination. 3 ring
sets provide a better labyrinth seal to protect components
from heavy dirt and heavy splash water contamination.
104
smalley.com
No-Tooling-Charges™ For Customs
Laminar Seal Ring Applications
A. Coupling
B. Bearing Protection
C. Pulley Idler
D. High Speed Spindle
A.Coupling
The seal arrangement in this
assembly has been custom
designed for optimum protection
against contamination. Gases
build up pressure in a center
cavity, protected on both ends
from contaminants entering.
Manufactured in USA
B. Bearing Protection
The 3 ring set protects the ball
bearing from contaminants like
dirt and water. The seal retains
grease/lubricant and prevents
contaminates from penetrating
into the critical components of
the assembly.
C. Pulley Idler
The ring set designed in this
application extends the life
of the ball bearing by keeping
contaminants from penetrating
the precision bearing surfaces
even though the bearing itself
is sealed. When the shaft rotates
only the groove ring rotates
while the housing rings
remain stationary.
D.High Speed Spindle
The QS series has been designed
into the spindle assembly to
protect the tandem bearings
against corrosive elements.
Though it is not the primary seal
in the assembly, it is designed
as the final seal protecting the
bearings. All rings in the set will
cling to the shaft due to the
high rotational speed of the
main spindle.
Smalley (847) 719-5900 105
Laminar Seal Rings
Single-Turn Rings
Single-Turn Laminar Sealing Rings YH or YS are used for a wide
variety of applications. They are commonly used to protect bearing
systems by retaining grease/lubricant and preventing water or other
contaminating liquids from penetrating into the critical areas of an
assembly. The alternating (staggered) series YHK and YSK offer (due
to an increased labyrinth seal) further improved sealing efficiency.
They are often specified where the lubricating grease may liquefy due
to higher operating temperatures or where protection against larger
amounts of contaminating liquids (such as cooling water) is required.
YH
The standard Single-Turn Laminar Rings listed in the table below are
readily available (from stock). Customs can be manufactured with
No-Tooling-Charges™.
YHK
B
A
D
D1
D
D1
YSK
YS
A
B
Product Dimensions All dimensions in inches unless otherwise specified.
D1 D2
D2
D1
Tolerances (in)
D
A-B
RW
T
D2
D1
0.625 - 4.499 +0.004
–0.000
+0.004
-0.004
+0.002
-0.002
+0.008
-0.000
+0.000
-0.008
4.500 - 9.999 +0.008
-0.000
+0.006
-0.006
+0.003
-0.003
+0.012
-0.000
+0.000
-0.012
10.000 - 14.999 +0.010
-0.000
+0.007
-0.007
+0.004
-0.004
+0.012
-0.000
+0.000
-0.012
15.000 50.000
+0.010
-0.000
+0.015
-0.010
+0.005
-0.005
+0.016
-0.000
+0.000
-0.016
Bore Shaft1
D
0.625 - 1.249
1.250-1.499
1.500-1.749
1.750-2.249
2.250-2.749
2.750-2.999
3.000-3.249
3.250-3.499
3.500-3.999
4.000-4.499
4.500-4.999
5.000-5.499
5.500-6.249
6.250-7.749
7.750-9.999
10.000 -12.499
12.500 -14.999
15.000 -19.999
20.000 -24.999
25.000 -29.999
30.000 -50.000
Groove2
Width A
B
0.072
0.072
0.084
0.102
0.102
0.102
0.102
0.102
0.102
0.102
0.131
0.131
0.158
0.187
0.187
0.217
0.217
0.307
0.310
0.310
0.310
0.119
0.119
0.139
0.170
0.170
0.170
0.170
0.170
0.170
0.170
0.215
0.215
0.254
0.301
0.301
0.346
0.346
0.496
0.504
0.504
0.504
Ring Dimensions
RW
T
0.055
0.065
0.078
0.095
0.113
0.123
0.128
0.138
0.158
0.168
0.188
0.200
0.225
0.250
0.312
0.350
0.375
0.437
0.500
0.567
0.750
Groove Diameter
D2 0.021 (D) +0.134
0.021
+0.154
0.025
+0.180
0.031
+0.214
0.031
+0.250
0.031
+0.270
0.031
+0.280
0.031
+0.300
0.031
+0.340
0.031
+0.360
0.039
+0.408
0.039
+0.432
0.046
+0.490
0.055
+0.540
0.055
+0.702
0.063
+0.778
0.063
+0.828
0.093
+0.952
0.093
+1.158
0.093
+1.292
0.093
+1.658
Groove
Diameter
D1
(D) -0.134
-0.154
-0.180
-0.214
-0.250
-0.270
-0.280
-0.300
-0.340
-0.360
-0.408
-0.432
-0.490
-0.540
-0.702
-0.778
-0.828
-0.952
-1.158
-1.292
-1.658
Standard raw materials are carbon steel and 302 stainless steel.
If axial movement occurs during operation, an increase to Groove Width
may be necessary to avoid friction between Rings and Groove.
3
See page 130 for how to order.
1
2
106
smalley.com
No-Tooling-Charges™ For Customs
Double-Turn Rings
Double-Turn Laminar Sealing Rings offer a higher clamping force when
installed in the bore or on the shaft. They are suited for higher operating
speeds, have 360° contact (no axial gap) and should be used where
application conditions are more severe. One typical application is where
high amounts of dirt and dust are present and the ring sets provide the
necessary seal against contamination from outside elements.
Double-Turn Laminar Ring Sets are also used to protect contacting radial
seals, rubber seals, O-rings and other oil seals. For protection in the most
severe environment the alternating (staggered) sets YHKD and YSKD are
the preferred choice by engineers. They provide sealing with 360° contact
in both the bore and on the shaft.
YHD
The standard Double-Turn Laminar Rings listed in the table below
are readily available (from stock). Customs can be manufactured with
No-Tooling-Charges™.
YHKD
B
A
D
D1
D
D1
YSKD
YSD
A
B
Product Dimensions All dimensions in inches unless otherwise specified.
Bore
Shaft1
D
0.625 - 1.249
1.250-1.499
1.500-1.749
1.750-2.249
2.250-2.749
2.750-2.999
3.000-3.249
3.250-3.499
3.500-3.999
4.000-4.499
4.500-4.999
5.000-5.499
5.500-6.249
6.250-7.749
7.750-9.999
10.000 -12.499
12.500 -14.999
15.000 -19.999
20.000 -24.999
25.000 -29.999
30.000 -50.000
Groove2
Width B
A
0.098
0.098
0.112
0.136
0.136
0.136
0.136
0.136
0.136
0.136
0.172
0.172
0.202
0.238
0.242
0.274
0.278
0.398
0.398
0.405
0.413
0.145
0.145
0.166
0.204
0.204
0.204
0.204
0.204
0.204
0.206
0.254
0.254
0.299
0.353
0.357
0.405
0.412
0.592
0.596
0.608
0.620
Ring Dimensions
T
RW
0.055
0.065
0.078
0.095
0.113
0.123
0.128
0.138
0.158
0.168
0.188
0.200
0.225
0.250
0.312
0.350
0.375
0.437
0.500
0.567
0.750
Groove Diameter
D2 (D) +0.134
0.043
+0.154
0.043
+0.180
0.050
+0.214
0.062
+0.250
0.062
+0.270
0.062
+0.280
0.062
+0.300
0.062
+0.340
0.062
+0.360
0.062
+0.408
0.078
+0.432
0.078
+0.490
0.093
+0.540
0.111
+0.702
0.111
+0.778
0.127
+0.828
0.127
+0.952
0.187
+1.158
0.187
+1.292
0.187
+1.658
0.187
Groove
Diameter
D1
(D) -0.134
-0.154
-0.180
-0.214
-0.250
-0.270
-0.280
-0.300
-0.340
-0.360
-0.408
-0.432
-0.490
-0.540
-0.702
-0.778
-0.828
-0.952
-1.158
-1.292
-1.658
D1 D2
D2
D1
Tolerances (in)
D
A-B
RW
T
D2
D1
0.625 - 4.499
+0.004
-0.000
+0.004
-0.004
+0.0025
-0.0025
+0.008
-0.000
+0.000
-0.008
4.500 - 9.999 +0.008
-0.000
+0.006
-0.006
+0.003
-0.003
+0.012
-0.000
+0.000
-0.012
10.000 - 14.999 +0.010
-0.000
+0.007
-0.007
+0.004
-0.004
+0.012
-0.000
+0.000
-0.012
15.000 50.000
+0.010
-0.000
+0.015
-0.010
+0.005
-0.005
+0.016
-0.000
+0.000
-0.016
Standard raw materials are carbon steel and 302 stainless steel.
If axial movement occurs during operation, an increase to Groove Width
may be necessary to avoid friction between Rings and Groove.
3
See page 130 for how to order.
1
2
Manufactured in USA
Smalley (847) 719-5900 107
Laminar Seal Rings
Metric Single-Turn Rings
Single-Turn Laminar Sealing Rings QH or QS are used for a wide
variety of applications. They are commonly used to protect bearing
systems by retaining grease/lubricant and preventing water or other
contaminating liquids from penetrating into the critical areas of an
assembly. The alternating (staggered) series QHK and QSK offer (due
to an increased labyrinth seal) further improved sealing efficiency.
They are often specified where the lubricating grease may liquefy due
to higher operating temperatures or where protection against larger
amounts of contaminating liquids (such as cooling water) is required.
QH
The Metric Single-Turn Laminar Rings listed in the table below are
readily available (from stock). Customs can be manufactured with
No-Tooling-Charges™.
QHK
B
A
D
D1
D
QSK
QS
A
B
D1 D2
D2
D1
Tolerances (mm)
D
A-B
RW
T
D2
D1
15 - 104.9
+0.10
-0.00
+0.10
-0.10
+0.04
-0.02
+0.20
-0.00
+0.00
-0.20
105 - 149.9
+0.15
-0.00
+0.10
-0.20
+0.05
-0.03
+0.25
-0.00
+0.00
-0.25
Product Dimensions All dimensions in millimeters unless otherwise specified.
D1
150 - 439.9
+0.20
-0.00
+0.15
-0.30
+0.06
-0.04
+0.30
-0.00
+0.00
-0.30
440 1300
+0.25
-0.00
+0.20
-0.40
+0.07
-0.05
+0.40
-0.00
+0.00
-0.40
Bore Shaft3
D
Groove2
Width A
B
Ring Dimensions
RW
T
15
25
30
36
43
49
52
60
70
75
80
90
100
105
110
120
130
150
150¹
171
171¹
200
200¹
260
320
400
440
440¹
601
700
800
900
1000
2.2
2.2
2.2
2.2
2.4
2.4
2.4
2.7
2.7
2.7
2.7
2.7
2.7
3.3
3.3
3.3
3.3
3.4
5.1
3.4
5.1
4.1
5.1
5.1
5.2
5.2
5.2
8.3
8.3
8.3
8.3
8.3
8.4
1.0
1.2
1.5
1.8
2.2
2.4
2.6
2.8
3.1
3.3
3.5
3.8
4.1
4.3
4.6
5.0
5.5
6.0
6.0
7.0
7.0
8.0
8.0
9.0
10.0
11.0
12.0
12.0
14.0
16.0
18.0
20.0
22.0
- 24.9
- 29.9
- 35.9
- 42.9
- 48.9
- 51.9
- 59.9
- 69.9
- 74.9
- 79.9
- 89.9
- 99.9
- 104.9
- 109.9
- 119.9
-129.9
-149.9
-170.9
- 170.9
-199.9
- 199.9
-259.9
- 259.9
-319.9
-399.9
-439.9
-600.9
- 600.0
-699.9
-799.9
-899.9
-999.9
-1300.0
3.6
3.6
3.6
3.6
4.0
4.0
4.0
4.5
4.5
4.5
4.5
4.5
4.5
5.5
5.5
5.5
5.5
5.6
8.2
5.6
8.2
6.6
8.2
8.2
8.3
8.3
8.3
13.5
13.5
13.5
13.5
13.5
13.6
Groove Diameter
D2 0.65 (D) + 2.6
0.65
+ 3.0
0.65
+ 3.6
0.65
+ 4.2
0.72
+ 5.0
0.72
+ 5.4
0.72
+ 5.8
0.82
+ 6.2
0.82
+ 6.8
0.82
+ 7.2
0.82
+ 7.6
0.82
+ 8.2
0.82
+ 8.8
0.98
+ 9.2
0.98
+ 9.8
0.98
+10.8
0.98
+11.8
1.00
+13.0
1.50
+13.0
1.00
+15.0
1.50
+15.0
1.20
+18.0
1.50
+18.0
1.50
+20.0
1.50
+22.0
1.50
+24.0
1.50
+26.0
2.50
+26.0
2.50
+32.0
2.50
+36.0
2.50
+40.0
2.50
+44.0
2.50
+48.0
Groove
Diameter
D1
(D) - 2.6
- 3.0
- 3.6
- 4.2
- 5.0
- 5.4
- 5.8
- 6.2
- 6.8
- 7.2
- 7.6
- 8.2
- 8.8
- 9.2
- 9.8
-10.8
-11.8
-13.0
-13.0
-15.0
-15.0
-18.0
-18.0
-20.0
-22.0
-24.0
-26.0
-26.0
-32.0
-36.0
-40.0
-44.0
-48.0
Increased cross-section.
If axial movement occurs during operation, an increase to Groove Width
may be necessary to avoid friction between Rings and Groove.
3
See page 130 for how to order.
1
2
108
smalley.com
No-Tooling-Charges™ For Customs
Metric Double-Turn Rings
Double-Turn Laminar Sealing Rings offer a higher clamping force when
installed in the bore or on the shaft. They are suited for higher operating
speeds, have 360° contact (no axial gap) and should be used where
application conditions are more severe. One typical application is where
high amounts of dirt and dust are present and the ring sets provide the
necessary seal against contamination from outside elements.
Double-Turn Laminar Ring Sets are also used to protect contacting radial
seals, rubber seals, O-rings and other oil seals. For protection in the most
severe environment the alternating (staggered) sets QHKD and QSKD are
the preferred choice by engineers. They provide sealing with 360° contact
in both the bore and on the shaft.
QHD
The Metric Double-Turn Laminar Rings listed in the table below are
readily available (from stock). Customs can be manufactured with
No-Tooling-Charges™.
Product Dimensions All dimensions in millimeters unless otherwise specified.
Bore Shaft3
D
15
25
30
36
43
49
52
60
70
75
80
90
100
105
110
120
130
150
150¹
171
171¹
200
200¹
260
320
400
440
440¹
601
700
800
900
1000
-
24.9
- 29.9
- 35.9
- 42.9
- 48.9
- 51.9
- 59.9
- 69.9
- 74.9
- 79.9
- 89.9
- 99.9
- 104.9
- 109.9
- 119.9
- 129.9
- 149.9
- 170.9
- 170.9
- 199.9
- 199.9
- 259.9
- 259.9
- 319.9
- 399.9
- 439.9
- 600.9
- 600.9
- 699.9
- 799.9
- 899.9
- 999.9
- 1300.0
Groove2
Width A
B
2.9
2.9
2.9
2.9
3.2
3.2
3.2
3.6
3.6
3.6
3.6
3.6
3.6
4.3
4.3
4.3
4.3
4.4
6.5
4.4
6.5
5.3
6.5
6.5
6.6
6.6
6.6
10.6
10.8
10.8
11.0
11.0
11.0
4.3
4.3
4.3
4.3
4.8
4.8
4.8
5.4
5.4
5.4
5.4
5.4
5.4
6.4
6.4
6.4
6.4
6.5
9.6
6.5
9.6
7.8
9.6
9.6
9.8
9.8
9.8
15.9
16.2
16.2
16.5
16.5
16.5
Ring Dimensions
RW
T
1.0
1.2
1.5
1.8
2.2
2.4
2.6
2.8
3.1
3.3
3.5
3.8
4.1
4.3
4.6
5.0
5.5
6.0
6.0
7.0
7.0
8.0
8.0
9.0
10.0
11.0
12.0
12.0
14.0
16.0
18.0
20.0
22.0
Groove Diameter
D2 1.30
(D) + 2.6
1.30
+3.0
1.30
+3.6
1.30
+4.2
1.45
+5.0
1.45
+5.4
1.45
+5.8
1.65
+6.2
1.65
+6.8
1.65
+7.2
1.65
+7.6
1.65
+8.2
1.65
+8.8
1.96
+9.2
1.96
+9.8
1.96
+10.8
1.96
+11.8
2.00
+13.0
3.00
+13.0
2.00
+15.0
3.00
+15.0
2.40
+18.0
3.00
+18.0
3.00
+20.0
3.00
+22.0
3.00
+24.0
3.00
+26.0
5.00
+26.0
5.00
+32.0
5.00
+36.0
5.00
+40.0
5.00
+44.0
5.00
+48.0
B
D
D1
D
QSD
Groove
Diameter
D1
(D) - 2.6
-3.0
-3.6
-4.2
-5.0
-5.4
-5.8
-6.2
-6.8
-7.2
-7.6
-8.2
-8.8
-9.2
-9.8
-10.8
-11.8
-13.0
-13.0
-15.0
-15.0
-18.0
-18.0
-20.0
-22.0
-24.0
-26.0
-26.0
-32.0
-36.0
-40.0
-44.0
-48.0
QHKD
A
D1
QSKD
A
B
D2
D1 D2
D1
Tolerances (mm)
D
A-B
RW
T
D2
D1
15 - 104.9 +0.10
-0.00
+0.10
-0.10
+0.08
-0.04
+0.20
-0.00
+0.00
-0.20
105 - 149.9 +0.15
-0.00
+0.10
-0.20
+0.10
-0.06
+0.25
-0.00
+0.00
-0.25
150 - 439.9 +0.20
-0.00
+0.15
-0.30
+0.12
-0.08
+0.30
-0.00
+0.00
-0.30
440 1300
+0.25
-0.00
+0.20
-0.40
+0.14
-0.10
+0.40
-0.00
+0.00
-0.40
Increased cross-section.
If axial movement occurs during operation, an increase to Groove Width
may be necessary to avoid friction between Rings and Groove.
3
See page 130 for how to order.
1
2
Manufactured in USA
Smalley (847) 719-5900 109